Quartz-mill



(No Model.)

J. DAY. QUARTZMILL.

Patented Mar. 14,1882.

1m I HIIIIIII III,

mid/Q UNITED STATES PATENT OFFICE.

JAMES DAY, OF SAN FRANCISCO, CALIFORNIA.

QUARTZ-M LL.

SPECIFICATION forming part of Letters Patent No. 254,805, dated March 14, 1882,

Application filed July 18, 1881. (No model.)

To all whom it may concern:

Be itknown that I, JAMES DAY, of the city and county of San Francisco, State of California, have invented an Improvement in Quartz Mills; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to quartz-mills or orestamps, the object of which is to increase the force of stroke of the stamp without adding more weight thereto.

My invention consists in the following construction and arrangement of parts, whereby the object of my invention is attained, and which will be first fully described, and the points of novelty set forth in the claim. All of this will be fully seen in the course of the following description, and by reference to the accompanying drawings, in which- Figure 1 shows front elevation of the stampmill. Fig.2 shows an elevation of the same. Fig. 3 shows a vertical section ,of same. Fig. 4 shows details.

A represents an ordinary mortar, in which the ore is placed. and B the stamp, with its stem 0 guided and supported by the frame D, all in the usual manner.

E represents the tappet upon the "stem, and F the cam, which is revolved by appropriate power, and which is adapted to impinge against the tappet and xaise the stem and stamp, and to release said tappet, so that the stamp may dropupon the ore in the mortar below.

To the top of the frame D are bolted or otherwise secured brackets I, to which is bolted the cylinder G. In this cylinder is the piston H, in this case being shown as an ordinary pump-piston. It is well packed within the cylinder by cup-leather, kept moist and soft'by oil or glycerine.

The top of the cylinder is open to expose the top of the piston to the atmosphere. It is obvious, however, that any other form of piston or packing may be used which is suitable to create a vacuum within the cylinder. To the top of the piston or to its rod is secured by nut, as shown,a cross-head, J, extending across the cylinder and projecting on both sides. In its ends are fitted rods or bars K K, the ends of which are secured thereto by nuts. These rods extend downwardly through appropriate guide notches or grooves in the cylinder-base and brackets, and are provided with a cross-piece, L, to which their ends are secured by nuts. This cross-piece or follower is so placed that the top of the stem 0, when raised by the cam, will impinge against it and raise it up. In doing this it raises the piston and creates a vacuum in the cylinder. When the cam releases the stem the pressure of the atmosphere will drive the piston home, and the cross-base L, striking the top ofthe stem, will give the stamp a momentum much greater than it would have if allowed to fall by its own weight. This additional force is a matter of advantage, because I am enabled to use lighter stamps and still have as much force in their stroke. Although I have here shown the device as being connected with an ordinary ore-stamp battery, it is obvious that the same principle and devicemay be applied to any form of quartzmill or other mills whose object is to crush material by the action of stamps or heaters.

The principle is to provide practical means for increasing the blow of the heater, and this object is obtained by the mechanism herein shown.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In a crushing-mill, a stamp or beater and mechanism for raising and dropping the same, in combination with the cylinder G, air-tight piston H, and sliding frame consisting of the cross-head J, cross-base L, and side bars or rods, K K, arranged for operation substantially as set forth.

In witness whereof I have hereunto set my hand.

' JAMES DAY. Witnesses:

WM. E. BOOTH, S. H. NoURsE. 

